Post with an insulator for an electric wire



May 28, 1957 A. J. G. KEMPFF POST WITH AN INSULATOR FOR AN susc'raxcWIRE Filed May 18, 1953 INVENTOR AKDRIES JOHAN GERRIT KEMPFF AT OREYPOST WITH AN INSULAI'gIlJR FOR AN ELECTRIC Andries Johan Gerrit Kemplf,The Hague, Netherlands Application May 18, 1953, Serial No. 355,640

Claims priority, application Netherlands May 17, 1952 4 Claims. (Cl.17445) This invention relates to a pile or post provided with aninsulator for fixing an electric wire thereto and more especiallyadapted for use in supporting the current conducting wires of anelectric wire fencing.

The known posts in electric wire fencings are generally provided withinsulators which may be easily damaged and wherein the fastening memberssecuring the insulators to the posts are exposed to rusting, or saidinsulators present the drawback that in case of extensive installationsconsiderable electric leakage will occur.

It is an object of the present invention to obviate these drawbacks andto provide a post construction permitting the insertion of a reliableinsulator which needs no maintenance due to its safe location and themanner in which it is secured to the pile or post.

According to the invention the insulator extends in the longitudinaldirection of the pile or post in a lateral recess thereof.

Another object of the invention is to provide the insulator withlongitudinal inner channels through which extends at least one metal rodembodied in the pile.

A further object is to make the pile of reinforced concrete wherein saidmetal rod or rods form the longitudinal reinforcement of the pile.

Still further objects, features and details of the present inventionwill appear from the following description with reference to theaccompanying drawings in which a preferred embodiment of the inventionhas been shown by way of example and in which:

Fig. 1 shows the upper part of a fencing pile or post according to theinvention in side elevation, and

Fig. 2 is a front elevation.

The illustrated pile or post 1 is a concrete pile of substantiallysquare cross section and provided with four longitudinal reinforcingrods, of which in Fig. 1 the rods 2 and 3 and in Fig. 2 the rods 3 and 4are shown.

The pile 1 has a lateral recess 5 through which extend the rods 3 and 4.An insulator 6 made of porcelain, insulating glass or any other suitablematerial is accommodated in said recess 5. In order to increase the pathfor surface leakage currents, if any, the insulator may be surrounded bysuitably formed thickened parts 7. The insulator 6 is further providedwith two longitudinal inner channels 8 and 9 in which the rods 3 and 4are accommodated. The space between the walls of the channels 8 and 9and the rods 3 and 4, respectively, is taken up by fillers 10 and 11,respectively, of resilient material, such as e. g. rubber; due to thisfilling material no mortar can penetrate between the rods and theinsulator when manufacturing the pile, and no water can gather there,either.

The extremities 12 and 14 of the insulator 6 extend somewhat beyond theupper face 13 and the lower face 15, respectively, of the recess so asto be partially embedded in the concrete mass of the pile. Thisarrangement causes lateral forces acting upon the insulator to betransferred directly to the concrete of the pile, so that the insulator6 cannot move with respect to the rods 3 and 4.

trite States Patent 0 "ice This is of great importance, since otherwisemoisture might easily penetrate between the insulator 6 and the faces 13and 15 of the recess 5 and due to rusting of the rods 3 and 4 by suchmoisture the insulator might be cracked or damaged. Moreover, if theinsulator was not rigidly secured in position, very high localcompressive stresses might readily occur within the insulator near thefaces 13 and 15 of the recess 5, when the pile is under such bendingstrain as to shorten the side of the pile containing said recess 5; andthis might cause breaking of the insulator. If, however, the saidinsulator is effectively locked in position in accordance with thisinvention, the upper and lower faces 13 and 15 of the recess 5, whichduring moulding of the pile perfectly adjoin the upper and lowersurfaces of the insulator, will transmit the compressive stresses inequally distributed manner to the insulator and the latter will thusconsiderably contribute to the strength and rigidity of the pile, atleast when the pile is subject to a load whereby the insulator 6 lies inthe compression zone. Should, however, the insulator be located in thetension zone, then the tensile stress will be taken undisturbedly by therods 3 and 4. The strength obtained by this construction is ofparticular importance, when the recess is situated at a considerabledistance from the pile head; this is the case, for instance, when, inaddition to the recess 5 with insulator near the pile head, the pile hasa second recess with an insulator for fixing a shock wire at a lowerelevation.

In order to prevent rain water flowing along the pile from reaching theinsulator, the upper face 13 of the recess 5 is provided with a drip rim16.

The shock wire may be easily secured to the insulator 6 by means of aseparate piece of wire passed around the central portion of theinsulator. The construction is so strong that large tensile stressesoccurring in the wire do not present any inconvenience, not even forcorner piles.

If desired, the insulator 6 may be replaced by two insulators eachenclosing one of the rods 3 and 4.

It is of great advantage that no parts extend beyond the normalcross'sectional shape of the pile, since the transport of the piles isgreatly facilitated thereby.

What I claim is:

1. A post for an electric wire fencing made of concrete or othermoldable material and having a laterally opening recess, at least onereinforcing rod integral with and extending through the post in thelongitudinal direction thereof, said reinforcing rod having an exposedportion in said recess, and an insulator accommodated in said recess andsurrounding the exposed portion of said reinforcing rod.

2. A post for an electric wire fencing according to claim 1; wherein theextremities of said insulator are embedded in the adjoining end wallsdefining said recess in the longitudinal direction to form anintermediate and integral block of material in said recess for takingand distributing compressive stresses occurring in the post on the sideof said recess.

3. A post for an electric wire fencing made of concrete or othermoldable material and having a laterally opening recess, at least onereinforcing rod integral with and extending through the post in thelongitudinal direction thereof, said reinforcing rod having an exposedportion in said recess, and an insulator surrounding said exposedportion of the reinforcing rod and arranged in said lateral recess sothat the outer circumference of said insulator is within the contours ofsaid post.

4. A post for an electric wire fencing of concrete or other moldablematerial and having a laterally opening recess, reinforcing rodsintegral with and extending through the post in the longitudinaldirection of the latter and spaced from the center line of said post, atleast one of said reinforcing rods extending through said recess to forman exposed portion therein, and an insulator surrounding said exposedportion of said one reinforcing rod and fitted in said lateral recess"to form an intermediate member integral with the end walls definingsaid recess in the longitudinal direction, whereby tensile andcompressive stresses occurring in the post on the side of said lateralrecess are taken respectively by said reinforcing rod extending throughthe recess and by said in- 10 termediate members surrounding saidreinforcing rod.

References Cited in the file of this patent UNITED STATES PATENTSBissell Mar. 31, 1885 Lapp July 25, 1905 Bell Sept. 3, 1912 Gerow May25, 1948 FOREIGN PATENTS Great Britain June 4, 1923

